##### http://autoconf-archive.cryp.to/ax_check_awk_array_delete_elem.html
#
# SYNOPSIS
#
#   AX_CHECK_AWK_ARRAY_DELETE_ELEM([ACTION-IF-SUCCESS],[ACTION-IF-FAILURE])
#
# DESCRIPTION
#
#   Check if AWK supports delete on array element. If successful
#   execute ACTION-IF-SUCCESS otherwise ACTION-IF-FAILURE.
#
#   This work is heavily based upon testawk.sh script by Heiner Steven.
#   You should find his script (and related works) at
#   <http://www.shelldorado.com/articles/awkcompat.html>. Thanks to
#   Alessandro Massignan for his suggestions and extensive nawk tests
#   on FreeBSD.
#
# LAST MODIFICATION
#
#   2007-02-13
#
# COPYLEFT
#
#   Copyright (c) 2007 Francesco Salvestrini <salvestrini@users.sourceforge.net>
#
#   Copying and distribution of this file, with or without
#   modification, are permitted in any medium without royalty provided
#   the copyright notice and this notice are preserved.

AC_DEFUN([AX_CHECK_AWK_ARRAY_DELETE_ELEM], [
  AX_TRY_AWK_EXPOUT([array delete element],
    [],[ a[1]=1; delete a[1]; if (a[1]!=0) exit (1) ],[],
    [$1],[$2])
])